So far Mr. Diamond’s presence on Twitter is minimal. He hasn’t tweeted. The avatar is a photo of Mr. Diamond on a boat, holding a large fish and wearing a Colby College hat (Mr. Diamond is a Colby alum and has a building there named after him). And he’s following just one person, his daughter Nell. (Incidentally, Ms. Diamond made waves on Twitter after her father’s 2012 ouster when she had some choice words for top British politicians.)